My volume is not going up or down, stays mute and Accidently deleted senary audio.

Perform these steps in order on the Surface Laptop (Windows 10/11). They focus on restoring audio and undoing the effect of deleting the audio device/driver (such as Senary Audio):

1. Run the audio troubleshooter (Surface/Windows)
   • Open the Get Help app (search for “Get Help” from Start).
   • In Get Help, run the audio troubleshooter. It will automatically run diagnostics and attempt to fix most sound and audio issues, including missing or disabled devices.
2. Check that the correct output device is selected
   • Select the Speakers icon on the taskbar.
   • Select the arrow to the right of the volume slider to open the list of audio devices.
   • Make sure the built‑in speakers/headphones device (not an external monitor without speakers) is selected as the output device.
3. Verify volume and mute status in Volume mixer
   • Right‑click (or press and hold) the Speakers icon on the taskbar.
   • Select Open Volume mixer (Windows 10) or Volume mixer from Start > Settings > System > Sound (Windows 11).
   • Ensure the System and app sliders are turned up and not muted.
   • If any slider shows a mute icon (red circle or “x”), select it to unmute.
4. Confirm the device is not disabled in Sound settings
   • Go to Start > Settings > System > Sound.
   • In Windows 11: under Output, select the audio device, then open More sound settings (under Advanced).
   • In Windows 10: select the audio device and choose Device properties.
   • Make sure the device is enabled (Windows 11: Device usage = Use this device (enable); Windows 10: Disable checkbox is cleared for both output and input devices).
5. Set the default audio device (if using USB/HDMI)
   If an external monitor or USB audio device is connected:
   • Open Control Panel > Hardware and Sound > Sound.
   • On the Playback tab, right‑click the correct speakers/headphones device and select Set as Default Device, then select OK.
6. Update or reinstall the audio driver
   Since an audio device/driver (like Senary Audio) was deleted, reinstalling the driver is critical:
   • Open Device Manager (search “Device Manager” from Start).
   • Expand Sound, video and game controllers.
   • If the audio device is present, right‑click it and select Update driver, then restart the PC.
   • If audio is still missing or the device is not listed, uninstall any problematic audio entry and then install the latest audio driver from the Surface/device manufacturer’s support site. After installation, restart the Surface.
7. If audio broke after a Windows update
   • In Device Manager, under Sound, video and game controllers, right‑click the audio device, select Properties, then the Driver tab, and choose Roll Back Driver if available.
   • Follow the prompts and restart. If that does not help, use a system restore point created before the issue, as described in Windows recovery options.

If the volume keys still do not change volume after these steps, but the device shows as enabled and working in Sound settings, use the Get Help audio troubleshooter again and, if needed, contact Surface support for further diagnostics.

References:

• Fix sound or audio problems in Windows
• Fix low or quiet sound in Windows
• Troubleshoot Surface sound and audio accessories
• My audio inputs and outputs suddenly disappeared, how do i fix this? - Microsoft Q&A
• Audio constantly muted - Microsoft Q&A
• Audio quality suddenly awful in Windows 11 - Microsoft Q&A
• NO SOUND DEVICE INSTALLED - Microsoft Q&A
• Windows 10 No Sound in HP Pavilion 17-g101dx - Microsoft Q&A